linux-kernel - Re: [linux-pm] [PATCH] pm: Add runtime PM statistics to sysfs

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Date:	Fri, 9 Jul 2010 11:00:27 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	<linux-pm@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] [PATCH] pm: Add runtime PM statistics to sysfs

On Thu, 8 Jul 2010, Arjan van de Ven wrote:

> From: Arjan van de Ven <arjan@...ux.intel.com>
> Subject: pm: Add runtime PM statistics to sysfs
> 
> In order for PowerTOP to be able to report how well the new runtime PM is working
> for the various drivers, the kernel needs to export some basic statistics in sysfs.
> 
> This patch adds two sysfs files in the runtime PM domain that expose the
> total time a device has been active, and the time a device has been suspended.
> 
> With this PowerTOP can compute the activity percentage
> 
> Active %age = 100 * (delta active) / (delta active + delta suspended)
> 
> and present the information to the user.
> 
> I've written the PowerTOP code (slated for version 1.12) already, and the output looks
> like this:
> 
> Runtime Device Power Management statistics
> Active  Device name
>  10.0%	06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E


> @@ -411,6 +433,7 @@ int __pm_runtime_resume(struct device *dev, bool from_wq)
>  	}
>  
>  	if (retval) {
> +		update_pm_runtime_accounting(dev);
>  		dev->power.runtime_status = RPM_SUSPENDED;
>  		pm_runtime_cancel_pending(dev);
>  	} else {

This line was added in the wrong place.  It belongs either before the 
"if (retval) {" or after the "} else {".

Alan Stern

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